To Design schematic, from Source to Terminal of Electric Heater in both cases AC and DC calculate losses, and Cost analysis and define which one is more efficient and economical to use for high power industrial electric heater 33.3 MW

An Experienced Electrical power Engineer needed To Design schematic, (from Source to Terminal of Electric Heater ) in both cases AC and DC calculate losses, and Cost analysis and then based on these define which Source Either AC or DC will be more efficient and economical to use for high power industrial Usage Electric Heater which is 33.3 MW, Remember That Heater has been Already designed which is compatible with both AC three phase 690 V and DC 398 V, the work starts from Supply source to Terminal of heater only. please first understand if still any doubt you can ask for clarification helping material will be provided.
thank you